I have had 18000 feet, 36000 feet in total (18000 out and 18000 back. But now I have the altered version of dji go 4 app, version 4.1.3 which is linked in videos on YouTube by simi travels which unlocks FCC mode no matter where you are in the world. Its exactly the same app, just that one slight distance. I do not break altitude regulations ever. But the horizontal distance perhaps a little... I stay at max altitude all the way though and fly straight out and back. Descending when drone is far away from RC will inhibit signal transmission and stir up people's privacy concerns the lower you go. Please people if you use this altered version or the normal dji go 4 app, don't break altitude regulations, and don't fly near airports. You risk ruining this hobby for everyone else.